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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdc.logging.context;
import org.openecomp.sdc.logging.api.context.ContextPropagationService;
import org.slf4j.MDC;
import java.util.Map;
/**
* Propagates the <a href="http://www.slf4j.org/manual.html#mdc">SLF4J Mapped Diagnostic Context (MDC)</a>
* of a thread onto a runnable created by that thread, so that the context is available when the runnable is executed
* in a new thread.
*
* @author evitaliy
* @since 12/09/2016.
*/
public class MDCPropagationService implements ContextPropagationService {
public Runnable create(Runnable task) {
return new MDCCopyingWrapper(task);
}
private static class MDCCopyingWrapper implements Runnable {
private final Runnable task;
private final Map<String, String> context;
private MDCCopyingWrapper(Runnable task) {
this.task = task;
this.context = MDC.getCopyOfContextMap();
}
@Override
public void run() {
Map<String, String> oldContext = MDC.getCopyOfContextMap();
replaceMDC(this.context);
try {
task.run();
} finally {
replaceMDC(oldContext);
}
}
private static void replaceMDC(Map<String, String> context) {
if (context == null) {
MDC.clear();
} else {
MDC.setContextMap(context);
}
}
}
}
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